Publication Date:
2024-06-14
Description:
During 2008–2020, four strong earthquakes occurred in Yutian, Xinjiang Uygur Automous Region, northwest
China, in particular, two M7 + and two M6 + earthquakes demonstrating the high tectonic activity of this region.
We systematically use multiple electromagnetic data from satellites and ground, such as GIM TEC (Global
Ionospheric Mapping Total Electron Content) published by JPL (Jet Propulsion Laboratory), and the ULF (Ultra
Low Frequency) electromagnetic waves and plasma parameters onboard DEMETER (Detection of Electro-
Magnetic Emission Transmitted from Earthquake Regions), Swarm and CSES (China Seismo-Electromagnetic
Satellite) satellites. The ionospheric perturbations were revealed frequently around the four case studies, but
mostly within 10 days before, over the epicentral area, and sometimes over its conjugate region at southern
hemisphere. The abnormal amplitude is quite larger in years with high solar activity than in those with low solar
activity. We employ the SAMI2 model to simulate the variations from the effects of E × B under different plasma
background in 2008 and 2014 to explain the great difference in different solar years. The similarity of the
anomalies in this region demonstrates the higher electromagnetic and chemical emissions, implying that the
electric field is possibly generated by the preparation of the seismic events in the epicentral area inducing the
ionospheric disturbances above this area and its conjugate region through this coupling channel.
Description:
Published
Description:
101943
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
